Q:What are bursts? Explain various types of bursts.

Burst

A term, usually associated with a TDMA system, describing a group of bits or other

information transmitted by the system. Also refers to the time the transmitter is on and radiating.

The

normal burst (NB)

: Used to carry information on traffic and control channels, except

for RACH. It contains 116 encrypted bits.

The

frequency correction burst (FB

): Used for frequency synchronization of the mobile.

The contents of this burst are used to calculate an unmodulated, sinusoidal oscillation, onto

which the synthesizer of the mobiles is clocked.

The

synchronization burst (SB)

: Used for time synchronization of the mobile. It contains

a long training sequence and carries the information of a TDMA frame number.

The

access burst (AB)

: Used for random access and characterized by a longer guard period

(256 ms) to allow for burst transmission from a mobile that does not know the correct

timing advance at the first access to a network (or after handover).

The

dummy burst (DB)

: Transmitted as a filler in unused timeslots of the carrier; does not

carry any information but has the same format as a normal burst (NB